Table 2.
Summary of the concentrations of air pollutants, and meteorological variables, Tehran (2010–2011)
| Mean (SD) | Minimum | P25 | P50 | P75 | P98 | Maximum | No. of station | No. of days | |
|---|---|---|---|---|---|---|---|---|---|
| PM10, Annual 24 h (μg/m3) |
90.58 (41.99) |
22.54 |
60.34 |
86.65 |
114.80 |
175.68 |
329.95 |
7 |
2438 |
| SO2, Annual 24 h (μg/m3) |
89.16 (29.27) |
45.47 |
69.24 |
84.47 |
101.60 |
161.45 |
313.27 |
10 |
3172 |
| NO2, Annual 24 h (μg/m3) |
85 (24.183) |
49.37 |
68.88 |
77.72 |
95.70 |
145.88 |
163.85 |
13 |
4115 |
| O3, Annual 8 h (μg/m3) |
68.82 (40.48) |
10.88 |
35.32 |
59.75 |
99.28 |
158.60 |
187.16 |
11 |
3530 |
| Temperature (°C) |
19.68 (9.87) |
−5 |
10.69 |
21.10 |
28.92 |
38.12 |
42 |
|
365 |
| Relative humidity (%) | 38.87 (16.45) | 6 | 27.82 | 34.23 | 48.70 | 62.84 | 100 | 365 |
No. Station: number of monitoring stations with valid observations.
No. days: number of days with valid observations.